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b in (-oo:+oo)
-30 = 3-5*b-(6*b) // - 3-5*b-(6*b)
6*b-(-5*b)-30-3 = 0
5*b+6*b-30-3 = 0
11*b-33 = 0 // + 33
11*b = 33 // : 11
b = 33/11
b = 3
b = 3
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